Aves, p�le ornithologique de Natagora

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Aves, 40/1-4 | 2003 | 38-44

  The Black Stork (Ciconia nigra) in Madrid region: status, population changes and reproduction.
Cano Alonso, L.S., Fernandez, M.

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The population of black Stork has augmented gradually since, at the end of the 1980s, its reproduction in the area was observed, increasing from 2 pairs in 1992, to 12 in 2000. 38.46% out of 65 confirmed attempts of reproduction were carried out on rock, and 61.54% on trees; we observed inter-species competition for the occupation of Black Stork nests on rock, by Griffon Vulture. The reporductive period of Black Stork in Madrid region ranges from the first week of March, when the laying of the first pair begins, until the end of august, when the last young flies. Predominantly, it occupies woodlands as nesting areas, in supramediterranean bioclimatic layers (higher altitude, lower temperature) as well as in mesomediterranean layers (lower altitude, milder temperatures). The pairs in the mesomediterranean zone mainly select the month of March for their laying, though they may also use the month of April, while the laying of pairs breeding in the supramediteeranean layer are more concentrated in time, in April. Neither the date of the laying nor the bioclimatic zone is more related to a higher breeding success, the pairs just adapt themselves to the environmental conditions to carry out their laying. During these 10 years there was a mean of 77.66% productive pairs; 168 youngs were born, 3 being the most frequent number of youngs born to a pair. The mean productivity during this period was of 2.32 flown youngs / stable pair, the reproductive success being 2.53 youngs able to fly / breeding pair, and the fledging rate of 2.98 youngs / number of pairs that managed to make their young fly. These data are superior to those from other areas of the Iberian Peninsula. Bexause of the reproduction parameters, we come to the conclusion that the Black Stork population of the region will stay stable in the next years.

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